Material discharge structure for hammer mills



J. R. HALL March 7, 1950 MATERIAL DISCHARGE STRUCTURE FOR HAMMER MILLS Filed Aug. 17, 1946 H H I V471,

Patented Mar. 7, 1950 MATERIAL DISCHARGE STRUCTURE FOR HAMIHEB MILLS John R. Hall, Chicago, 111., asaignor to International Harvester Company, a corporation of New Jersey Application August 17, 1946. Serial No. 691.358

1 Claim- (Cl. 241-41) This invention relates to a mill of the type commonly used for the comminution of material such as feed or the like. More specifically it relates to an improved construction for facilitating the removal of pulverized material from the receiving chamber of a mill.

The present invention contemplates and has for its principal object a mill construction containin improved means for facilitating the removal of pulverized material from said mill.

Another object is the provision of an improved receiving chamber for a mill, said chamber including an inclined narrow trough for facilitating the discharge of pulverized material to a suction conveyor.

Still another object is the provision of an improved suction means for removing pulverized material from the receiving chamber of a mill, said chamber being in communication with the atmosphere and providing an incoming stream of air which directs the pulverized material toward a conduit in communication with a suction device.

A still further object is the provision of an improved mill having a receiving chamber, said receiving chamber including an inclined lower wall serving to deflect material toward the material inlet opening of a conduit in communication with a suction device.

Other and more specific objects of the invention will appear from the following detailed description taken in conjunction with the accompanying sheet of drawings, in which:

Figure 1 is a side elevational view of a mill of conventional form having portions broken away to better illustrate relevant parts of the invention.

Figure 2 is an end view of the same structure taken substantially along the line 22 of Figure l.

The mill chosen for the purposes of illustration is'of the type commonly used for reducing feed for live stock. As indicated in the drawing by the numeral M, the mill comprises a casing II which is formed by a pair of upstanding spaced side walls l2. A pair of end walls l3 are connected between the side walls i2 and converge as best shown in Figure 1 toward a pair of skids It on which the mill is carried. An upper section I5 of the'casing II is formed with a feed throat I6. The feed throat I6 is in communication with the atmosphere by a perforated screen or element I]. A sliding door I 8 is adapted to be moved into or out of closed position to open or close the feed throat It with respect to a feed chute I9.

Positioned between the side walls I2 and con- 65 2 nected thereto is an arcuate screen 20. The arcuate screen divides the casing l I into a material reducing or comminution chamber 2! and a material receiving chamber 22. A rotor 23 of the conventional hammer type is mounted for rotation with a shaft 24 pivotally journaled in the side walls l2. A pulley 25 is connected for rota- A conduit 28 is in communication with the blower housing 26.

The lower portion of the casing H is provided with a diagonally extending plate 29. The plate 29, in conjunction with the converging end walls l3, forms a diagonally extending trough indicated by the reference character 30 which is a part of a material receiving chamber 30'. An air inlet Si is formed in one of the side walls l2 and provides for communication of the chamber 30' with the atmosphere. The air inlet 3| is formed by a perforated portion of the wall l2, said air inlet being positioned immediately adjacent to and above the uppermost portion of the diagonally extending plate 29. A baille 32, substantially parallel to the plate 29, is positioned above the air inlet opening 3|. Opposite the air inlet opening 3| is an opening 33 formed in the side wall I2. The opening 33 is positioned at the lowermost portion of the trough 30 and is in communication with a material receiving inlet 34 formed in the conduit 28. The end of the conduit 28, as best shown in Figure 2, is provided with a baflle 35 serving as the upper wall of an air inlet 36. The air inlet 36 is in communication with the atmosphere by means of an opening 31.

The operation of the mill previously described is generally conventional. Material to be reduced is fed into the feed throat l'l whereupon it comes in contact with the rotating hammers and is thereupon pulverized. The pulverized material falls through the screen 20 into the material receivin chamber 30'. The suction created by the fan 21 draws this material into the conduit 28 from which it is subsequently conveyed to a predetermined place or gathering means. In the conventional mill great difficulty has been encountered in removing the pulverized material. This diiliculty has been due to the clog ing and packing of the pulverized material in the area of the opening ll. In the present construction the material inlet opening ll, of the suction conduit 2|, and the air inlet opening ll are so are,

ranged that a. powerful and constant stream of air ilows over the diagonally extending plate 2!. As the pulverized material drops through the screen I! the material is caught in suspension in this air stream and is immediately diverted and proiected toward the material inlet opening 34. The baille 32 serves to channel this incoming air stream along the bottom and sides of the downwardly extending trough II. Since the pulverized material is thus caught in suspension in this continually moving air stream, the material will be forcefull projected thru the opening 33, and will not clog up said opening, thereby assuring efflcient functioning of the mill at all times. In view of the diagonally extending construction of the throat ll and the position of the air inlet II the suction device is continually emptying the material from the material receivin chamber II without interference or excessive piling up oi the material. It can be seen therefore that the unique construction of the trough 30 serves to assure the constant supply of pulverized material to the suction means. Material which may be lodged within the material receiving inlet 34 may be dislodged by an air stream entering through the auxiliary air opening 38. Thus a suitable and improved construction is provided for removing and conveying pulverized material.

Although the foregoing description and drawing refer to a mill oi the ime used in reducing feed or the like, it will be appreciated that the invention contemplates the provision of the foregoing ieatures on other types of material reducing machines.

It will be further understood that only a preferred form of construction has been illustrated and described, and that numerous modifications Number and alterations may be made therein without departing from the spirit and scope of the invention as defined in the appended claim.

Whatiaclaimcdis:

A hammer mill comprising a casing having upright spaced walls. a screen transversely positioned between said walls to divide said easing into an upper chamber for the comminution oi material and a lower material receiving chamber. a suction means connected adjacent the lower end of om of said walls, said suction means including a conduit having a horizontal portion with an opening in communication with the lower end of said material receiving chamber and an upwardly extending elbow, a first air inlet for the receiving chamber, said air inlet being positioned on one-o! said walls substantially adjacent the screen, a deflection plate positioned above said air inlet, said deflection plate bein arranged to divert material from the first inlet opening toward the suction conduit, a lower plate positioned transversely between the walls, srid plate being positioned immediately below the first air inlet opening and sloping downwardly toward the opening of said conduit, a second air inlet formed in one of said walls below the sloping bottom plate, and a transversely extending baille within the conduit, said baille being vertically spaced from the bottom of said conduit and extending longitudinally substantially beyond the opening of the conduit and terminating substantially adjacent the elbow to provide an air passage separate from and by-passing the material receiving chamber. said second air inlet being arranged to provide an incoming air stream to the passage.

JOHN R. HALL.

nnrnasucas crrnn The following reierences are of record in the file oi this patent:

UNITED STATE PATENTS Name Date 1,558,502 Power Oct. 27, 1925 1,713,094 Saiberlich May 14, 1929 2,325,886 Bisulak Aug. 3, 1943 

